Dude. It's tuff now. But just think back when you were a kid. Unless you are just abusing her, which you are obviously not, then she will realize later in life just who really cared for her.
BELIEVE me. You will get much more respect than her mother will.
Our daughter is 13 and she's an angel.
Ok, maybe not.
You are in a damn tuff spot. Ours responded to a 2 month grounding. Obviously you can't do that.
Good luck. It's tuff I know. I can't imagine how tuff it'd be without Moms complete support.